Question

3 times a number plus 12 minus 5 times the same number

Answer 1

3x + 12 - 5x = 22

-2x + 12 = 22
-2x = 22-12
-2x = 10

x = -5

hope this helps

Answer 2

Let the number is a

then:
3 times the number = 3a

plus  +12


minus      -

5 times the same number= 5a

--------------------------------------------- all together gives 22

SO:

3a + 12 - 5a = 22


Solving for a:

-2a + 12 = 22

-2a = 22-12

-2a = 10

a = -5

so  the number is -5

Done